Sylvania G53 LED bulbs are designed to replace halogen bulbs with the same fitting. 53 stands for the 53mm between the pins of this fitting. The G53, also called AR111, is mostly used as generic lighting due to the broad beam angle. When replacing your G53, make sure your new Sylvania G53 LED bulb has the same light color and (replacing) wattage. This way, you will maintain the light effect that your current light source emits.